PDTC123JU

PDTC123JU is a digital transistor from the PDTC family: an NPN transistor with an integrated base resistor. It is designed to be driven directly from a logic output (microcontroller, MCU) without needing an external base resistor, simplifying the drive circuit.
Key points:
- Built-in base resistor provides a known base current for switching
- Drives modest loads (e.g., LEDs, small relays, optocouplers)
- Reduces parts count and simplifies interfacing with logic signals
- Suitable for general switching applications; switching speed is adequate for most hobby/embedded use
Package/variant:
- PDTC123JU refers to a specific variant (and packaging) within the PDTC123J family; exact package type (TO-92, SMD, etc.) and base-resistor value vary—check the datasheet for the precise details.
What to check in the datasheet:
- Maximum collector current (Ic)
- Vce (collector-emitter voltage)
- Internal base resistor value
- Package type and mounting
In short: PDTC123JU is a self-contained digital transistor ideal for compact, logic-driven switching without external base resistors. For exact specs, consult the manufacturer datasheet.

PDTC123JU features:
- NPN digital transistor with built-in base resistor (no external base resistor needed)
- Can drive loads directly from microcontroller logic
- Vceo: typically 30 V (max ~35 V)
- Ic: up to 100 mA
- Internal base resistor provides defined base current; low input current required
- Low saturation voltage when ON (Vce(sat) ≈ 0.2–0.4 V at moderate Ic)
- Fast switching for general switching applications
- Pb-free / RoHS compliant
- Package: SOT-23 (3-pin) with standard tape & reel
- Operating/Storage temperature: wide range (roughly -55 to 125 C)
Applications: LED driving, small-signal switching, microcontroller interfacing.

- Pin count: 3 (SOT-23 package)
- Function: NPN digital transistor with an integrated base resistor; serves as a switch. Pin 1 = Base (with internal resistor), Pin 2 = Emitter, Pin 3 = Collector. No external base resistor needed; use as a low-side switch (load between Vcc and Collector).

Manufacturer: Panasonic (Panasonic Semiconductor Solutions), part of Panasonic Corporation.
What kind of company: Panasonic is a Japanese multinational electronics company that designs and makes a wide range of products, including consumer electronics, home appliances, automotive components, and semiconductor devices.

PDTC123JU is an NPN digital transistor with a built-in base resistor. Typical application areas:
- Directly driven by microcontrollers to switch loads
- Relay and coil drivers
- LED indicators and display backlight drivers
- Small solenoids, relays, and other low-current actuators
- General low-current switching and logic-level interfacing (sensors, gates)
In short: convenient, compact switches for driving small loads without external base resistors.

SOT-23 (3-pin surface-mount) package.